Rochester dual 210
1980 camaro rs
231 v6

I'm working on my first carb rebuild and I've gotten everything torn down accept the float and the power piston assembly. The piston is what's giving me all the trouble, does anyone know how to remove either of these parts? The power piston assembly doesn't move at all, if its supposed to, that means mine is completely frozen up. Car was sitting for a couple years and I live in Alaska. Let me know if you have any tips!